Bridges: the original social network. Connecting communities since 850 BC.
Bridges: the original social network. Connecting communities since 850 BC.
Did you know? The oldest bridge in the NBI was built in 1697.
over HWY CHELSEA STREET
L MYSTIC LOWER
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Fair overall condition rating of 5 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 42,492 vehicles per day and is 76 years old.
Its sufficiency rating of 55.8 places it below the national average of 63.6.
The NBI records a navigation clearance of 100 feet — the minimum vertical space below the bridge deck. The total height of the bridge structure (including towers, railings, and superstructure) may be higher.
For travelers with bridge anxiety
This bridge may cause some awareness for travelers with bridge anxiety, but has manageable characteristics.
This bridge is 439 feet long — a short crossing, about 10-15 seconds.
A truss bridge — the steel framework can provide a sense of enclosure.
About 100 feet above ground — a high bridge with significant elevation.
About 42,492 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 42 feet wide with 2-3 lanes — moderate width.
This bridge crosses over land, not water — no water views below.
This comfort score is designed to help individuals with bridge anxiety plan their travel. All bridges in the National Bridge Inventory are regularly inspected and deemed safe for travel. This is not medical advice — if you experience severe anxiety, please consult a healthcare professional.
Year Built
1950
76 years old
Structure Type
Steel Truss (Thru)
Total Length
439 ft
133.8 m
Deck Width
42 ft
12.7 m
Spans
1
sections between supports
Max Span
439 ft
longest unsupported section (133.8 m)
Traffic Lanes
3 lanes
One-way traffic
Clearance Below
100 ft
navigation clearance under deck
Clearance height compared to familiar objects
Height shown is the navigation clearance below the bridge deck. The total height of the bridge structure (including towers and superstructure) may be higher.
Daily Traffic
42,492vehicles/day
42.38018°N, 71.05172°W
Steel Truss (Thru)
A steel truss bridge uses a framework of interconnected triangular elements. The geometric rigidity of triangles makes this design extremely efficient at distributing loads.
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Data from the National Bridge Inventory (NBI), maintained by the Federal Highway Administration (FHWA).
Data year: 2025. Conditions may have changed since the last inspection.
This information is provided for educational and informational purposes only. It should not be used as the sole basis for any decisions related to bridge safety or transportation planning. Always consult official sources and local authorities for the most current data.